本文選題：耦合腔行波管　切入點：吸收小腔　出處：《電子科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：耦合腔行波管是最常見的一種大功率輸出行波管,被廣泛應(yīng)用于如警戒雷達、火控雷達、搜索雷達等大功率的場合。但因為自身固有結(jié)構(gòu)的特點,耦合腔行波管非常容易產(chǎn)生自激振蕩,嚴重影響行波管的性能。耦合腔行波管在工作過程中可能會產(chǎn)生很多種自激振蕩,如前向波振蕩、返波振蕩以及帶邊振蕩等,其中最難消除的就是帶邊振蕩。目前最常用的一種消除帶邊振蕩的方法就是在耦合腔行波管慢波結(jié)構(gòu)耦合槽的兩側(cè)分別加上兩個圓柱形吸收小腔,這種帶吸收小腔耦合腔行波管能夠有效的抑制帶邊振蕩的產(chǎn)生,有效提升行波管的輸出功率。本文主要圍繞帶吸收小腔耦合腔行波管理論與技術(shù)展開研究,主要的研究內(nèi)容包含以下三個方面:1.研究了休斯型耦合腔行波管慢波結(jié)構(gòu)的高頻色散、耦合阻抗以及衰減特性,然后又深入研究分析了耦合腔腔體結(jié)構(gòu)參量(如耦合槽張角、耦合槽寬度、腔體周期等)對腔體高頻特性的影響規(guī)律,這些分析研究為后面帶吸收小腔結(jié)構(gòu)耦合腔行波管的研究提供了基礎(chǔ)。2.從理論上分析耦合腔行波管極易產(chǎn)生帶邊振蕩的原因以及條件,然后簡單介紹了帶吸收小腔耦合腔行波管的結(jié)構(gòu)特點及工作原理,并對這種結(jié)構(gòu)的高頻特性以及場模式做了分析,并解釋了帶吸收小腔結(jié)構(gòu)能夠抑制帶邊振蕩的原因。最后又深入分析了吸收小腔結(jié)構(gòu)參量(如吸收小腔深入腔體深度、吸收小腔圓心角度等)對腔體色散特性的影響,并以此為基礎(chǔ)簡單介紹了基于961H休斯型耦合腔行波管的吸收小腔的設(shè)計流程。這些分析研究為后面帶吸收小腔耦合腔行波管高頻等效線路模型的研究提供了基礎(chǔ)。3.基于耦合腔行波管高頻結(jié)構(gòu)的特點,介紹了最常用的Curnow等效模型,并深入推導了基于Curnow模型的高頻色散以及耦合阻抗的解析計算公式。提出利用ADS仿真軟件的方法來求解高頻等效電路的色散特性,并驗證了這種方法的正確性。利用ADS仿真色散的方法,總結(jié)出了等效電路中電容、電感等元件參量對腔體高頻色散特性的影響規(guī)律,在此基礎(chǔ)上分析了帶吸收小腔耦合腔行波管高頻結(jié)構(gòu)等效線路模型,這些研究工作為后來的帶吸收小腔耦合腔行波管的注波互作用計算提供了理論基礎(chǔ)。
[Abstract]:Coupled cavity TWT is the most common type of high power TWT, which is widely used in high-power situations such as warning radar, fire control radar, search radar and so on. Coupled cavity TWT is very easy to produce self-excited oscillation, which seriously affects the performance of TWT. Many kinds of self-excited oscillations may occur in the working process of coupled cavity TWT, such as forward wave oscillation, backwave oscillation and band edge oscillation, etc. One of the most difficult to eliminate is the band edge oscillation. One of the most commonly used methods to eliminate the band edge oscillation is to add two cylindrical absorption cavities on the two sides of the coupled channel of the slow wave structure of the coupled cavity travelling-wave tube. This kind of TWT with small absorption cavity can effectively suppress the generation of band edge oscillation and effectively enhance the output power of TWT. This paper mainly focuses on the theory and technology of TWT with small absorption cavity. The main research contents include the following three aspects: 1. The high frequency dispersion, coupling impedance and attenuation characteristics of the slow wave structure of Hughes coupled cavity TWT are studied, and then the structural parameters of the coupled cavity, such as the opening angle of the coupled cavity, are analyzed in depth. The influence of coupling slot width, cavity period, etc.) on the high frequency characteristics of the cavity, These analytical studies provide a basis for the study of coupled-cavity TWT with a small absorption cavity structure. 2. Theoretically, the reason and conditions for the band-edge oscillation of the coupled cavity TWT are analyzed. Then, the structure characteristics and working principle of the coupled cavity TWT with small absorption cavity are briefly introduced, and the high frequency characteristics and the field mode of this structure are analyzed. Finally, the influence of the structure parameters (such as the depth of the cavity, the angle of the center of the cavity, etc.) on the dispersion characteristics of the cavity is analyzed. On the basis of this, the design flow of absorption small cavity based on 961H Hughes coupled cavity TWT is briefly introduced. These analysis and studies provide the basis for the research of high frequency equivalent circuit model of TWT with absorbing small cavity. Based on the characteristics of the high frequency structure of the coupled cavity TWT, In this paper, the most commonly used Curnow equivalent model is introduced, and the analytical formulas of high frequency dispersion and coupling impedance based on Curnow model are derived in depth. The method of ADS simulation software is proposed to solve the dispersion characteristics of high frequency equivalent circuits. By using ADS simulation dispersion method, the influence of capacitance, inductance and other component parameters on the high frequency dispersion characteristics of cavity is summarized. On this basis, the equivalent circuit model of high frequency structure of coupled-cavity TWT with small absorption cavity is analyzed, which provides a theoretical basis for the calculation of beam-wave interaction of TWT with small absorption cavity.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN124

【參考文獻】

相關(guān)期刊論文 前1條

1 劉順康，，張小津;抑制耦合腔行波管寄生振蕩的諧振損耗技術(shù)[J];真空電子技術(shù);1995年03期

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